diff --git a/sound/soc/tegra/tegra20_das.c b/sound/soc/tegra/tegra20_das.c
index 69c651274c12..d2801130a986 100644
--- a/sound/soc/tegra/tegra20_das.c
+++ b/sound/soc/tegra/tegra20_das.c
@@ -13,10 +13,90 @@
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <sound/soc.h>
-#include "tegra20_das.h"
 
 #define DRV_NAME "tegra20-das"
 
+/* Register TEGRA20_DAS_DAP_CTRL_SEL */
+#define TEGRA20_DAS_DAP_CTRL_SEL			0x00
+#define TEGRA20_DAS_DAP_CTRL_SEL_COUNT			5
+#define TEGRA20_DAS_DAP_CTRL_SEL_STRIDE			4
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P		31
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S		1
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P	30
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S	1
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P	29
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S	1
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P		0
+#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S		5
+
+/* Values for field TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
+#define TEGRA20_DAS_DAP_SEL_DAC1	0
+#define TEGRA20_DAS_DAP_SEL_DAC2	1
+#define TEGRA20_DAS_DAP_SEL_DAC3	2
+#define TEGRA20_DAS_DAP_SEL_DAP1	16
+#define TEGRA20_DAS_DAP_SEL_DAP2	17
+#define TEGRA20_DAS_DAP_SEL_DAP3	18
+#define TEGRA20_DAS_DAP_SEL_DAP4	19
+#define TEGRA20_DAS_DAP_SEL_DAP5	20
+
+/* Register TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL */
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL			0x40
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT		3
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE		4
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P	28
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S	4
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P	24
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S	4
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P	0
+#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S	4
+
+/*
+ * Values for:
+ * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
+ * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
+ * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
+ */
+#define TEGRA20_DAS_DAC_SEL_DAP1	0
+#define TEGRA20_DAS_DAC_SEL_DAP2	1
+#define TEGRA20_DAS_DAC_SEL_DAP3	2
+#define TEGRA20_DAS_DAC_SEL_DAP4	3
+#define TEGRA20_DAS_DAC_SEL_DAP5	4
+
+/*
+ * Names/IDs of the DACs/DAPs.
+ */
+
+#define TEGRA20_DAS_DAP_ID_1 0
+#define TEGRA20_DAS_DAP_ID_2 1
+#define TEGRA20_DAS_DAP_ID_3 2
+#define TEGRA20_DAS_DAP_ID_4 3
+#define TEGRA20_DAS_DAP_ID_5 4
+
+#define TEGRA20_DAS_DAC_ID_1 0
+#define TEGRA20_DAS_DAC_ID_2 1
+#define TEGRA20_DAS_DAC_ID_3 2
+
+struct tegra20_das {
+	struct device *dev;
+	struct regmap *regmap;
+};
+
+/*
+ * Terminology:
+ * DAS: Digital audio switch (HW module controlled by this driver)
+ * DAP: Digital audio port (port/pins on Tegra device)
+ * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
+ *
+ * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
+ * DAC, or another DAP. When DAPs are connected, one must be the master and
+ * one the slave. Each DAC allows selection of a specific DAP for input, to
+ * cater for the case where N DAPs are connected to 1 DAC for broadcast
+ * output.
+ *
+ * This driver is dumb; no attempt is made to ensure that a valid routing
+ * configuration is programmed.
+ */
+
 static struct tegra20_das *das;
 
 static inline void tegra20_das_write(u32 reg, u32 val)
@@ -32,7 +112,7 @@ static inline u32 tegra20_das_read(u32 reg)
 	return val;
 }
 
-int tegra20_das_connect_dap_to_dac(int dap, int dac)
+static int tegra20_das_connect_dap_to_dac(int dap, int dac)
 {
 	u32 addr;
 	u32 reg;
@@ -48,31 +128,8 @@ int tegra20_das_connect_dap_to_dac(int dap, int dac)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dac);
-
-int tegra20_das_connect_dap_to_dap(int dap, int otherdap, int master,
-				   int sdata1rx, int sdata2rx)
-{
-	u32 addr;
-	u32 reg;
-
-	if (!das)
-		return -ENODEV;
-
-	addr = TEGRA20_DAS_DAP_CTRL_SEL +
-		(dap * TEGRA20_DAS_DAP_CTRL_SEL_STRIDE);
-	reg = (otherdap << TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P) |
-		(!!sdata2rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P) |
-		(!!sdata1rx << TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P) |
-		(!!master << TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P);
-
-	tegra20_das_write(addr, reg);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(tegra20_das_connect_dap_to_dap);
 
-int tegra20_das_connect_dac_to_dap(int dac, int dap)
+static int tegra20_das_connect_dac_to_dap(int dac, int dap)
 {
 	u32 addr;
 	u32 reg;
@@ -90,7 +147,6 @@ int tegra20_das_connect_dac_to_dap(int dac, int dap)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(tegra20_das_connect_dac_to_dap);
 
 #define LAST_REG(name) \
 	(TEGRA20_DAS_##name + \
diff --git a/sound/soc/tegra/tegra20_das.h b/sound/soc/tegra/tegra20_das.h
deleted file mode 100644
index 18e832ded73a..000000000000
--- a/sound/soc/tegra/tegra20_das.h
+++ /dev/null
@@ -1,120 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * tegra20_das.h - Definitions for Tegra20 DAS driver
- *
- * Author: Stephen Warren <swarren@nvidia.com>
- * Copyright (C) 2010,2012 - NVIDIA, Inc.
- */
-
-#ifndef __TEGRA20_DAS_H__
-#define __TEGRA20_DAS_H__
-
-/* Register TEGRA20_DAS_DAP_CTRL_SEL */
-#define TEGRA20_DAS_DAP_CTRL_SEL			0x00
-#define TEGRA20_DAS_DAP_CTRL_SEL_COUNT			5
-#define TEGRA20_DAS_DAP_CTRL_SEL_STRIDE			4
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P		31
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S		1
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P	30
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S	1
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P	29
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S	1
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P		0
-#define TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S		5
-
-/* Values for field TEGRA20_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
-#define TEGRA20_DAS_DAP_SEL_DAC1	0
-#define TEGRA20_DAS_DAP_SEL_DAC2	1
-#define TEGRA20_DAS_DAP_SEL_DAC3	2
-#define TEGRA20_DAS_DAP_SEL_DAP1	16
-#define TEGRA20_DAS_DAP_SEL_DAP2	17
-#define TEGRA20_DAS_DAP_SEL_DAP3	18
-#define TEGRA20_DAS_DAP_SEL_DAP4	19
-#define TEGRA20_DAS_DAP_SEL_DAP5	20
-
-/* Register TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL */
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL			0x40
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT		3
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE		4
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P	28
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S	4
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P	24
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S	4
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P	0
-#define TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S	4
-
-/*
- * Values for:
- * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
- * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
- * TEGRA20_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
- */
-#define TEGRA20_DAS_DAC_SEL_DAP1	0
-#define TEGRA20_DAS_DAC_SEL_DAP2	1
-#define TEGRA20_DAS_DAC_SEL_DAP3	2
-#define TEGRA20_DAS_DAC_SEL_DAP4	3
-#define TEGRA20_DAS_DAC_SEL_DAP5	4
-
-/*
- * Names/IDs of the DACs/DAPs.
- */
-
-#define TEGRA20_DAS_DAP_ID_1 0
-#define TEGRA20_DAS_DAP_ID_2 1
-#define TEGRA20_DAS_DAP_ID_3 2
-#define TEGRA20_DAS_DAP_ID_4 3
-#define TEGRA20_DAS_DAP_ID_5 4
-
-#define TEGRA20_DAS_DAC_ID_1 0
-#define TEGRA20_DAS_DAC_ID_2 1
-#define TEGRA20_DAS_DAC_ID_3 2
-
-struct tegra20_das {
-	struct device *dev;
-	struct regmap *regmap;
-};
-
-/*
- * Terminology:
- * DAS: Digital audio switch (HW module controlled by this driver)
- * DAP: Digital audio port (port/pins on Tegra device)
- * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
- *
- * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
- * DAC, or another DAP. When DAPs are connected, one must be the master and
- * one the slave. Each DAC allows selection of a specific DAP for input, to
- * cater for the case where N DAPs are connected to 1 DAC for broadcast
- * output.
- *
- * This driver is dumb; no attempt is made to ensure that a valid routing
- * configuration is programmed.
- */
-
-/*
- * Connect a DAP to a DAC
- * dap_id: DAP to connect: TEGRA20_DAS_DAP_ID_*
- * dac_sel: DAC to connect to: TEGRA20_DAS_DAP_SEL_DAC*
- */
-extern int tegra20_das_connect_dap_to_dac(int dap, int dac);
-
-/*
- * Connect a DAP to another DAP
- * dap_id: DAP to connect: TEGRA20_DAS_DAP_ID_*
- * other_dap_sel: DAP to connect to: TEGRA20_DAS_DAP_SEL_DAP*
- * master: Is this DAP the master (1) or slave (0)
- * sdata1rx: Is this DAP's SDATA1 pin RX (1) or TX (0)
- * sdata2rx: Is this DAP's SDATA2 pin RX (1) or TX (0)
- */
-extern int tegra20_das_connect_dap_to_dap(int dap, int otherdap,
-					  int master, int sdata1rx,
-					  int sdata2rx);
-
-/*
- * Connect a DAC's input to a DAP
- * (DAC outputs are selected by the DAP)
- * dac_id: DAC ID to connect: TEGRA20_DAS_DAC_ID_*
- * dap_sel: DAP to receive input from: TEGRA20_DAS_DAC_SEL_DAP*
- */
-extern int tegra20_das_connect_dac_to_dap(int dac, int dap);
-
-#endif
